// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/gfx/geometry/rect_f.h"

#include <algorithm>

#if defined(OS_IOS)
#include <CoreGraphics/CoreGraphics.h>
#elif defined(OS_MACOSX)
#include <ApplicationServices/ApplicationServices.h>
#endif

#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "ui/gfx/geometry/insets_f.h"
#include "ui/gfx/geometry/safe_integer_conversions.h"

namespace gfx {

static void AdjustAlongAxis(float dst_origin,
    float dst_size,
    float* origin,
    float* size)
{
    *size = std::min(dst_size, *size);
    if (*origin < dst_origin)
        *origin = dst_origin;
    else
        *origin = std::min(dst_origin + dst_size, *origin + *size) - *size;
}

#if defined(OS_MACOSX)
RectF::RectF(const CGRect& r)
    : origin_(r.origin.x, r.origin.y)
    , size_(r.size.width, r.size.height)
{
}

CGRect RectF::ToCGRect() const
{
    return CGRectMake(x(), y(), width(), height());
}
#endif

void RectF::Inset(const InsetsF& insets)
{
    Inset(insets.left(), insets.top(), insets.right(), insets.bottom());
}

void RectF::Inset(float left, float top, float right, float bottom)
{
    origin_ += Vector2dF(left, top);
    set_width(std::max(width() - left - right, static_cast<float>(0)));
    set_height(std::max(height() - top - bottom, static_cast<float>(0)));
}

void RectF::Offset(float horizontal, float vertical)
{
    origin_ += Vector2dF(horizontal, vertical);
}

void RectF::operator+=(const Vector2dF& offset)
{
    origin_ += offset;
}

void RectF::operator-=(const Vector2dF& offset)
{
    origin_ -= offset;
}

InsetsF RectF::InsetsFrom(const RectF& inner) const
{
    return InsetsF(inner.y() - y(),
        inner.x() - x(),
        bottom() - inner.bottom(),
        right() - inner.right());
}

bool RectF::operator<(const RectF& other) const
{
    if (origin_ == other.origin_) {
        if (width() == other.width()) {
            return height() < other.height();
        } else {
            return width() < other.width();
        }
    } else {
        return origin_ < other.origin_;
    }
}

bool RectF::Contains(float point_x, float point_y) const
{
    return (point_x >= x()) && (point_x < right()) && (point_y >= y()) && (point_y < bottom());
}

bool RectF::Contains(const RectF& rect) const
{
    return (rect.x() >= x() && rect.right() <= right() && rect.y() >= y() && rect.bottom() <= bottom());
}

bool RectF::Intersects(const RectF& rect) const
{
    return !(IsEmpty() || rect.IsEmpty() || rect.x() >= right() || rect.right() <= x() || rect.y() >= bottom() || rect.bottom() <= y());
}

void RectF::Intersect(const RectF& rect)
{
    if (IsEmpty() || rect.IsEmpty()) {
        SetRect(0, 0, 0, 0);
        return;
    }

    float rx = std::max(x(), rect.x());
    float ry = std::max(y(), rect.y());
    float rr = std::min(right(), rect.right());
    float rb = std::min(bottom(), rect.bottom());

    if (rx >= rr || ry >= rb)
        rx = ry = rr = rb = 0; // non-intersecting

    SetRect(rx, ry, rr - rx, rb - ry);
}

void RectF::Union(const RectF& rect)
{
    if (IsEmpty()) {
        *this = rect;
        return;
    }
    if (rect.IsEmpty())
        return;

    float rx = std::min(x(), rect.x());
    float ry = std::min(y(), rect.y());
    float rr = std::max(right(), rect.right());
    float rb = std::max(bottom(), rect.bottom());

    SetRect(rx, ry, rr - rx, rb - ry);
}

void RectF::Subtract(const RectF& rect)
{
    if (!Intersects(rect))
        return;
    if (rect.Contains(*static_cast<const RectF*>(this))) {
        SetRect(0, 0, 0, 0);
        return;
    }

    float rx = x();
    float ry = y();
    float rr = right();
    float rb = bottom();

    if (rect.y() <= y() && rect.bottom() >= bottom()) {
        // complete intersection in the y-direction
        if (rect.x() <= x()) {
            rx = rect.right();
        } else if (rect.right() >= right()) {
            rr = rect.x();
        }
    } else if (rect.x() <= x() && rect.right() >= right()) {
        // complete intersection in the x-direction
        if (rect.y() <= y()) {
            ry = rect.bottom();
        } else if (rect.bottom() >= bottom()) {
            rb = rect.y();
        }
    }
    SetRect(rx, ry, rr - rx, rb - ry);
}

void RectF::AdjustToFit(const RectF& rect)
{
    float new_x = x();
    float new_y = y();
    float new_width = width();
    float new_height = height();
    AdjustAlongAxis(rect.x(), rect.width(), &new_x, &new_width);
    AdjustAlongAxis(rect.y(), rect.height(), &new_y, &new_height);
    SetRect(new_x, new_y, new_width, new_height);
}

PointF RectF::CenterPoint() const
{
    return PointF(x() + width() / 2, y() + height() / 2);
}

void RectF::ClampToCenteredSize(const SizeF& size)
{
    float new_width = std::min(width(), size.width());
    float new_height = std::min(height(), size.height());
    float new_x = x() + (width() - new_width) / 2;
    float new_y = y() + (height() - new_height) / 2;
    SetRect(new_x, new_y, new_width, new_height);
}

void RectF::SplitVertically(RectF* left_half, RectF* right_half) const
{
    DCHECK(left_half);
    DCHECK(right_half);

    left_half->SetRect(x(), y(), width() / 2, height());
    right_half->SetRect(
        left_half->right(), y(), width() - left_half->width(), height());
}

bool RectF::SharesEdgeWith(const RectF& rect) const
{
    return (y() == rect.y() && height() == rect.height() && (x() == rect.right() || right() == rect.x())) || (x() == rect.x() && width() == rect.width() && (y() == rect.bottom() || bottom() == rect.y()));
}

float RectF::ManhattanDistanceToPoint(const PointF& point) const
{
    float x_distance = std::max<float>(0, std::max(x() - point.x(), point.x() - right()));
    float y_distance = std::max<float>(0, std::max(y() - point.y(), point.y() - bottom()));

    return x_distance + y_distance;
}

float RectF::ManhattanInternalDistance(const RectF& rect) const
{
    RectF c(*this);
    c.Union(rect);

    static const float kEpsilon = std::numeric_limits<float>::is_integer
        ? 1
        : std::numeric_limits<float>::epsilon();

    float x = std::max<float>(0, c.width() - width() - rect.width() + kEpsilon);
    float y = std::max<float>(0, c.height() - height() - rect.height() + kEpsilon);
    return x + y;
}

bool RectF::IsExpressibleAsRect() const
{
    return IsExpressibleAsInt(x()) && IsExpressibleAsInt(y()) && IsExpressibleAsInt(width()) && IsExpressibleAsInt(height()) && IsExpressibleAsInt(right()) && IsExpressibleAsInt(bottom());
}

std::string RectF::ToString() const
{
    return base::StringPrintf("%s %s",
        origin().ToString().c_str(),
        size().ToString().c_str());
}

RectF IntersectRects(const RectF& a, const RectF& b)
{
    RectF result = a;
    result.Intersect(b);
    return result;
}

RectF UnionRects(const RectF& a, const RectF& b)
{
    RectF result = a;
    result.Union(b);
    return result;
}

RectF SubtractRects(const RectF& a, const RectF& b)
{
    RectF result = a;
    result.Subtract(b);
    return result;
}

RectF BoundingRect(const PointF& p1, const PointF& p2)
{
    float rx = std::min(p1.x(), p2.x());
    float ry = std::min(p1.y(), p2.y());
    float rr = std::max(p1.x(), p2.x());
    float rb = std::max(p1.y(), p2.y());
    return RectF(rx, ry, rr - rx, rb - ry);
}

} // namespace gfx
